-The online version and the app are basically identical, so students don't have any trouble switching back and forth. This makes it easy for students to complete smaller tasks at home, even without a tablet.
-Evaluate student work right in the app (online or device) for instant feedback, and you can even assign a grade.
-Use the assignment folders to easily organize your classroom work into "project" or "unit" folders.
-The Shared Folder inside each assignment folder is a fantastic way to send files to all students at once (PDF, .mov, .jpg, etc.).
-Parents are able to access students' accounts, and with the way the folders are organized, Showbie can be used as a "portfolio" to demonstrate student learning.
I can't use the pen/markup tool in the online version. That's it...everything else is amazing.
Get the Pro version. It is 100% worth it. If you don't, you won't be able to get the most out of Showbie (upload limits, and restrictions on the number of assignments/classes/folders, etc.)
I have started using Showbie groups and other features to collaborate with colleagues both in my building and outside of my building. We can have discussions, and share resources with one another. I have also started using Showbie to collaborate on projects between classrooms in the building.